You have chosen 'Sense Data and the Percept Theory' by Roderick Firth, 'Concerning the Author' by Charles Sanders Peirce and 'Principles of Arithmetic, by a new method' by Giuseppe Peano
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| A. | Classical Physics | |
| B. | Modern Physics | |
| C. | Space | |
| D. | Time | |
| E. | Cosmology | |
| F. | Chemistry | |
| G. | Biology |